Power take-off



July-12, 1932- c. J. EssELlNG 1,867,257

POWER TAKE-OFF Filed Aug. 18, 1950 2 Sheets-Sheet 1 C. J Osse/"gg /NveNTalQ July 12, 1932 c. J. Essi-:LING 1,867,257

' POWER TAKE-OFF Fi'led Aug. 18, 1950 2 Sheets-Sheet 2 W. W f

Patented July 12, 1932.

Unie

POWER Taxis-OFFl 5- f 'i Application sied August 1s, 1930, serial No. 476,144,7am1fin the Netherlands aulyio, 1930.

My copending application for Patent No. 450,838, filed May 8, 1930, discloses a motor truck having a driven Wheeled rear axle, a tool mounted on the truck, a drive shaft for said tool mounted on the truck in parallel relation with the rear axle, friction wheels on the drive shaft substantially in the planes passing through the wheels on the rear axle,

` and mea-ns for bringing the wheels on the rear axle into operative engagement with the friction wheels. y

My present invention, which relates to certain improvements of my said earlier construction, resides therein that the suspen- 1 sion springs of the drive axle, after being detached 4 from said axle, or from a spring shackle, are used, through the medium of elevating mechanism, for pulling the axle upwards as soon as they are tensioned, so that they act to press the drive wheels against the friction wheels. The tool on the truck can be thrown out by means of a hand lever, by the clutch of the motor, or by any other suitable means. The pressure between the drive wheels and the friction wheels can easily be limited to a predetermined maximum value, so that the motor can not be overloaded.

The novel construction has the additional advantage that the suspension springs of the truck are adapt-ed to move the drive wheels through a comparatively great distance, so that also the friction wheels of the tool may be provided with pneumatic tires. Should the pneumatic tiresvnot be sufliciently inflated, the spring pressure and, consequently, the maximum friction moment will be reduced, so that the tires will not be subjected to excessive wear. Y Y Y 1f, as will ordinarily be the case, the tool will have to remain in operation during a long time, the time required 'for disconnecting the suspension springs and'attaching the reverting mechanism can beneglected.

The drawings illustrate three embodiments of my invention. y

Fig. 1 is a part side elevational view of a motor truck in accordance with my invention,

Fig. 2 is a rear elevational view thereof,

Figs.` 3and f1 arefdiagra'ms showing two other methods for using the suspension ysprings fof'lthefjdrive axle to press the drive wheels against the friction wheelsof the tool. In accordance with Figs. 1 and 2,"the rear ends vof the suspen-sionisprings 6have been disconnected from the rear or l drive axle 7 of the motor truck. Cl'amped on theV rea-r axle 7 are straps `8 secured toA rods l9, the top ends of whichy arepivotally connected to levers 10. t.

Said levers are suspended from the longitudi- Y nal beams 1 1 ofthe motor truck frameby means of vertically adjustable eyey bolts 12.

At their' other ends, the levers 10 are'pivoted a to connecting rod-s 13 which, in turn, are pivotally associated with straps 14 temporarily clamped to the suspension springs 6. Y

The drive wheel`s15 as shown are clear of the ground,due tothe frame of the truck being lifted by a screw jack 19 vor the like.

Wheels 15 which drive the shaft 17 are in frictional engagement with the friction wheels 16 by means of which a` tool 18 mounted upon the truck can be driven. The pressure` exerted by wheels 15, 16 upon one another is brought about by the springs 6 through the medium of the reversing levers 10, it being understood that springs 6 are suitably tensioned by adjustment of Jthe eye bolts 1 The arms of each lever 10 have unequal lengths, and the pressure between wheels 15 and 16 is determined yby the position of the eye-bolt 12. For ay given position of this eyebolt, however, the pressure is determined by the ratio between the lengths of the arms of said lever.

The springs 6 have clamps 20 secured intermediate their ends,rto which the ends of the transverse spring 21, are connected, as customary. l

In accordance with Fig. 3, the suspension spring 17 need not be disconnected from its shackles 17a, but in this case it should be detached from the rear axle 7 Otherwise, this device operates exactly as the one shown in Figs. 1-2. f

Fig. 4 illustrates an arrangement in which the suspension spring 18 is disconnected from p its rear shackle 19. Evidently, rod 20 is unj 2 i l 12,867,257

derstrain of compressionl and rod21 under Y strain of tension The end kof lreversing lever l22 is suspended lfrom eye bolt 12, Otherwise the loperation 'of this mechanism does not v5 di'ier .y essentially fromthat of the device illustrated iii- Figs l, 2 and 3. Y *L lW hat I claim is z .Y Y n 1 TheA combination with a truck andits y motorW driven rear axle, of a tool laxleon the "ltruck, tool'drivi'ng- Wheels on the tool""axle',

springs detachably, connecting the-,frame of e vthev truck' and -rear axle, ylevers connected with the truck frame, rods connected to they endsV ofjthe levers, stra s carried bythe jm springs'and axle, said ro s being adaptedto Y f2 vertical movement, levers connected With'fthe bolts, rodsconne'cted tothe ends of the levers, springs detachably connecting the frame and rear axle, meansfor connecting the rods respectively tothe springs and rear `axle when -3.0 the springs are `disengaged from the rear axles, whereby Vvertical adjustment of the bolts will flex the Springs and elevate the axle :to move the Wheels oftheY axle into driving engagement with the tool driving Wheels.

,535` In testimony whereof I affix my signature.

vCommuns J; ESSELING.. 

